Electric-pump governor.



H. M. P. WIRPHSL'i ELECTRIC PUMP GOVERNQB. APPLICATION FILED SEPT. Z6, 1,910.

'1,037,039.- Patent@ @ggf/,1912,

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Avrom@ d own A issu? yer- piston 2 to throw the same quickly to its outer position. This movement of the actuating piston closesthe eXhaust through the passage 14 and shifts the main controlling switch to its open position to .cut the pump out of'operation. The actuating piston is then held tightly against its seat 21and the pressure equalizing through passages 14 and 11 upon the piston 6 allows the spring 8 to return the same to its seat 7. As the groove 18 instem 17 maintains atmospheric pressure beneath piston 12 the parts remain in this position until the pumpl pressurel has diminished to the point at which the spring 1-9 overcomes the fluid pressure acting on piston 12, at Which time the seat 15 is slightly raised from the gasket 16. The fili-lid pressures acting on opposite sides of the valve piston 12 are then immediately balanced, by the equalization of the reservoir pressure from cylinder 3 through passages 13 and 14, as restricted groove 18 is too small to permit the escape of any considera-ble volume of fluid, and the spring 19 returns the pist-on valve V12 rapidly to lits inner position, thereby opening conm'iuni'cation between ports 14 and 13. As the pressure acting on the piston 2 in cylinder 3 begins to fall, due to the escape of fluid through groove 18 and outlet port. 20, the spring 4 moves the piston 2 away from its seat 21 and thereby opens a large by-pass and exhaust passage from the face of the actuating piston through ports 13 and 14 and outlet port 24 to the atmosphere. The spring 4 then acts to return the piston 2 to its inner position and to throw the controlling device to its closed position with a quick, positive and snap-like action, thereby again cutting .in the pump.

The ports 13 and 14 are of large capacity, in order to permit thel supply or release of a large volume of fluid quickly to or from the cylinder 3 and thereby efl'ect a sudden and positive movement of'. the piston and controlling switch from one position to the other. 4

The range of the governor, or the diiiierence between the'cutting in and cutting out' pressures may be made anything desiredby the adjustment of the springs 8 and 19. During the time that the/ pump is eut out, and after the valve pist`on 6 has returned to its seat, the pressure upon the actuating piston 2 and the valve piston 12 is maintained by the feed through the small port 23, so that any leakage from the face of the actuating piston is compensatedfor.

The modilied construction shown in Fig. 2 is substantially the same as thatof Fig. 1 except that the .valve pistons are arranged to operate' horizontally instead of vertically7 and the valve piston 12 is provided with an additional smallseat 25 tor controlling the supply of fluid from the reservoir conneccomprising an abutment, or diaphragm 30 'in Fie. 2 the aum )s mav all be controlled s i i the pressure of the system, thereby distribut- .ters Patent, is

tion 5 through ports 2.6I and 13 to maintain the pressure instead of the small port .23

illustrated in F ig. 1. v F ig. 2 also illustrates an additional feature of my'improvement,

, subject on one side to the reservoir4 pressure in lchamber 28 and on the other side, in chamber 29, to the pressure of another source, such as 'a reservoir pipe line 34, which may be employed for connecting several reservoirs Where each reservoir is provided With a pump for furnishing coinpressed fluid thereto, and it is desirable that all of the pumps should operate together to raise the pressure in the system'to its'maximum cutting out point. Thel stems of the valve pistons 6 and ,12 are extended through close fit-ting guides into a small chamber 27, from which leads a port 31, and the diaphragm 30 is provided with a valve 38 for controlling communication from port 31 to port 32 and the atmosphere. Spring 35 normally holds theval've 33 closed. The operation `of this form of my improvement, When used with a single pump and reservoir, will now be readily understood from the foregoing description. W hen employed in connection with a plurality of pumps and reservoirs connected by areservoir pipe line, each pump and reservoir being provided 9.5 With a governor, it is diiiieult to adjust all the governors to cutin at exactly theisame degree of pressure; but with my improved differential pressure attachment, asshown substantially simultaneously, as will now be described: llllienthe pressure has diminished in one reservoir to such a point that this governor operates to cut in its pump, the other governors .vill be 'very'nearly at their cutting in points also, and as the pressure in the reservoir pipe line begins to increase over that in the other reservoirs, on account of the check at each reservoir, the diaphragm 30 of each of the governors raises the val-ve 83 and vvents the pressure in chamber 27 on the valve stem to the at-` mosphere, therebyv assisting the cuttingin spring 19 acting on the valve piston 12 suiicientlyto operate the governor to out in the pump. In the same nianner, each pump Will be eut i'n by its governor immediately after any other one of the governors cuts in, and `all of the pumps will assist in raising ing the labor equally among all the pumps. After the pumps .have all started working. and the pressure is raised to the desired maximum degree, each governor then operates independently to cut out its pump, as before described; 1

Having now described my invention, what l claim as newT and desire to secure by liet- 1. A pump governor comprising a main iinenns and at@ f i0 W dosed. by said. member in one posltion 'hoi and means cm'lmed by said membz: 1001, th@ p'essme in Said esmvor.. 7;;

a pis-u @man 0V saisi 'i' by sa Gnse,

hepump, and a spA W commumcatwn' Supp Ewoud vn comprising a imn I A). means E sa@ con'ohng' dene@ iol aauumg 12.3 minime .movable mmber Smm@a u Valve planen. a, swung?, ,clapm for .openingl eommuneution from the aetui utngf'piston to Suid sent side of the vulve piston when said vulve piston moves to its opposite position.

13. A pump governor comprising' a main controlling` device, a piston for actuating l same, a vulve pistou' having a seated positlon und sub]eet to the opposlngg pressures or the pump und a spuug, or supplymg Huid to Suid actuating piston when moved from its sent, u second vulve piston subject to the opposing,l p1l ssures of the pump und u sprne; for releusinp; Huid from said actuating; piston, und means f/or' balancing the ud pressures upon sind rst piston valve upon movement from its sent to thereby per# mit the spring' to return sume to the seated position. f

In testimony whereof I have hereunto set my hund.

` HOWARD MJP. MURPHY. *Witnesses v LEMNDER BEGG,

Known M. Lrozvs. 

